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  Allow a 30 minute warm-up period prior to making the following 

adjustments.

1.  Display the all white pattern.
2.  Set contrast to 255.
3.  Display plain green pattern.
4.  Slide the DY back and roughly adjust the plain green pattern with 

the purity magnet so that it is centered on the screen.

5.  Adjust the DY tilt.
 NOTE:  Set ROTATION to 128 and LCC_NS to 128 when 

adjusting the DY tilt.

6.  Lightly tighten the DY screw.

NOTE:  (1) After adjusting W/B (9300k), measure the average of 

ΣΙΚ 

with all white video input, while CONTRAST is maximum 
and BRIGHTNESS is centered. Make the adjustments so 
that the miss-landing becomes least after aging 2H with 
the 

ΙΚ

 30% of measured value shown above.

 (2) 

The 

magnetic 

Þ eld shall be BH = 0.

 

(3) When adjusting at other than BH = 0, calculate the shifted 

value from BH = 0.

1.  Place the monitor in the Helmholtz coil.
2.  Set as follows;
 

LCC-SW = 0  (LCC Correction Current = 0)

 

FUNCTION_SW bit1 =   (Auto Degauss = On)

 CONTRAST 

= 

255

3.  Display plain green pattern.
4.  Degauss the iron part of the chassis with a hand-degausser and 

degauss coil. 

5.  Degauss the CRT face with degauss equipment or hand-

degausser. 

6.  Input AC 230V to AC IN and turn the monitor off and on to activate 

the auto degausser.

Connect the communication cable of the connector located on the D Board on the monitor. Run the service software and then follow the 
instructions.

IBM at Computer

as a Jig

1

2

3

1-690-391-21

A-1500-819-A

Interface Unit

3-702-691-01
Connector Attachment

To BUS CONNECTOR

D-Sub

(9 Pin [female])

Mini Din

(8 Pin)

4 Pin

4 Pin

4 Pin

* The Parts above (          ) are necessary for DAS Adjustment.

1

3

~

7.  Reset FUNCTION_SW bit 1 to 0 (auto-degauss = off)
8 

Repeat step 5 by degaussing the CRT face with degauss 
equipment or hand-degausser. 

9.  Attach a wobbling coil to the speciÞ ed position of CRT neck.
10.  With landing checker, adjust DY position, purity, DY center, and 

landing of the 4 corners.

11.  Check landing of the 4 corners, and adjust using a magnet if they 

are not in the speciÞ cation.

 ± 6

 ± 6

 ± 6

 ± 6

 ± 6

 ± 6

 ± 6

 ± 6

 ± 6

<Specifications>
Adjust so that the green is within
the specification given right.
4 corner adjust target : within ± 1

The  red  and  blue  must  be  within
the  specification  given  right  with
respect to the green.

A difference between red and blue
must  be  within  the  specification
given right.

0 ± 3 0 ± 7.5 0 ± 3

0 ± 3 0 ± 7.5 0 ± 3

0 ± 3 0 ± 7.5 0 ± 3

(µm)

(µm)

10

10

10

10

7

10

10

10

10

(µm)

12.  Tighten DY screw within speciÞ ed torque, and auto-degauss.
 NOTE:  Torque 22 ± 2 kgcm (2.2 ± 0.2 Nm)
13.  Adjust the vertical angle of the DY to make the top and bottom 

pins equal (a = b). The horizontal angle is not changed (straight). 
Settle DY upright without leaning, and insert wedges Þ rmly so that 
the DY does not move.

a

b

c

d

<How to place wedge>
Green plain crosshatch pattern

a and b should be equal.
c and d should be equal.

Plaster RTV to both sides for the upper wedge.

Make sure that they settle inside DY.

Plaster RTV to one side for other wedges.

14.  Adjust the top and bottom pins correction VR.
15.  Adjust the horizontal trapezoid distortion by DY horizontal 

trapezoid correction VR.

16.  Check the landing at each corner. If the landing is not set to 

speciÞ cation, adjust the landing of the 4 corners with the landing 
magnet.

17.  Remove the sensor and wobbling coil.
18.  Switch signals to R, G, B, and then check that the pure colors 

have good color purity.

19.  Fix purity magnets with white paint. 

1.  Display the white crosshatch pattern.
2.  Pile the convex parts of the 6-pole magnet for convergence 

together.

3.  Roughly adjust H.CONV and V.CONV with the 4-pole magnet.

H.TRAP

TB-PIN

TLH

XCV

Purity

4-pole magnet

6-pole magnet

2-pole magnet

XBV

XCV

B

R

B

R

R
B

B
R

R

B

B

R 

TLV

TLH

YBH

YCH

R 

B

R 

B

  Convergence Specification

B

A

A

0.20 mm

B

0.24 mm

V

1. 9300 

K

 

x = 0.283 ± 0.005

 

y = 0.298 ± 0.005

  

 (All 

White)

2. 6500 

K

 

x = 0.313 ± 0.005

 

y = 0.329 ± 0.005

  

 (All 

White)

3. 5000 

K

 

x = 0.346 ± 0.005

 

y = 0.359 ± 0.005

  

 (All 

White)

B

a

a     1.8 mm
b     1.8 mm

a

b

b

A

MODE

A

B

4 : 3

352

264

5 : 4

330

264

1.  Adjust Focus (V) and Focus (H) for optimum focus.

Focus (V)

Focus (H)

All capacitors are in µF unless otherwise noted. pF : µµF 50WV or less 
are not indicated except for electrolytics and tantalums.
All electrolytics are in 50V unless otherwise speciÞ ed.
All resistors are in ohms.  k

Ω

=1000

Ω

, M

Ω

=1000k

Ω

Indication of resistance, which does not have one for rating electrical 
power, is as follows: 

Pitch : 5mm

   Rating 

electrical 

power 

: 

1

/

 4 

W

1

/

 4 

W in resistance, 

1

/

10 

W and 

1

/

 8 

W in chip resistance.

 : nonß ammable resistor.

: fusible resistor.

 : internal component.

 : panel designation and adjustment for repair.

 : earth ground
 : earth-chassis

All variable and adjustable resistors have characteristic curve B, unless 
otherwise noted.
Readings are taken with a color-bar signal input.
Readings are taken with a 10M

Ω

 digital multimeter.

Voltages are DC with respect to ground unless otherwise noted.
Voltage variations may be noted due to normal production tolerances.
All voltages are in V.
S : Measurement impossibillity.

: B+line.

: B-line  (Actual measured value may be different).

: signal path (RF).

!

!

Circled numbers are waveform references.

The components identiÞ ed by X in this basic schematic diagram 
have been carefully factory-selected for each set in order to 
satisfy regulations regarding X-ray radiation. Should replacement be 
necessary, replace only with the value originally used.

When replacing components identiÞ ed by Y, make the necessary 
adjustments as indicated.  If the results do not meet the speciÞ ed 
value, change the component identiÞ ed by X and repeat the 
adjustment until the speciÞ ed value is achieved. 
(Refer to Section 2: Safety Releated Adjustments.)
When replacing the parts listed in the table below, it is important to 
perform the related adjustments.

Part Replaced (    ) 

HV ADJ

RV901

Part Replaced (    ) 

D Board   C925, IC901, R901, R902, R905,

R924, R925, R926, RV901, 
T901 (FBT),
•  Mounted D Board

HV Regulator
Circuit Check

D Board   

C920, C923, D911, D912, R903, 
R917, R918, R919, R920, R923, 
T901 (FBT)  
•  Mounted D Board

N Board   

IC1001, RB1001
•  Mounted N Board  

N Board   

IC1001, RB1001
•  Mounted N Board  

HV HOLD
DOWN  
Circuit Check

D Board   

C930, D917, R921, R932, R933, 
R935, T901 (FBT) 
•  Mounted D Board

Beam Current
Protector  
Circuit Check

A1

N

US

H1

D

DA

A

TO D BOARD

CN1102

2

4

6

7

8

25

28

31

22

23

24

23

22

10

12

14

15

16

B1
G1
R1
V1
H1

OSD R

OSD G

OSD B

OSD BLK

V_DET

BLK

CLAMP

H OUT

V OUT

G.SYNC

R OUT

G OUT

B OUT

26

28

30

8

9

11

7

4

2

R OUT

G OUT

B OUT

5

3

1

R OUT

G OUT

B OUT

R IN

G IN

B IN

R IN

G IN

B IN

COF R
COF G
COF B

SCL

SDA

B2

G2

R2

V2

H2

13

22

23

SW

SCL
SDA

IC003

OSD

IC008

INPUT SELECT

IC001

RGB PRE-AMP

IC002

RGB AMP

15 14 13 12

18 20 1921

12 11 10

14

3

5

7

4

5

2

32

31

30

4

3

12

13

27

25

24

23

15

14

13

ROUT
GOUT
BOUT

SOG

SYNC IN

RCI
GCI
BCI

XTAL IN

HS OUT
VS OUT
ECO SW

SCL
SDA

HS OUT
VS OUT

ECO SW

SCL

SDA

SCL
SDA
HS OUT
VS OUT
ECO SW
HS IN
VS IN
CS IN

RIN
GIN
BIN

IC004

CUT OFF AMP

IC011

HEATER REG

X001

24.5MHz

18 1921

H FLY

OSD R

OSD G

OSD B

OSD BLK

AV

BLK

CLP

BUFFER

Q101,

Q201,

Q301

1
2
4
6
7
8
9

+B
+B
+80V
+12V
7V
3.3V
5V

+B

+80V
+12V

7V

3.3V

5V

CN312

G2

1

G2

CN318

5
3
1
7

KR
KG
KB
HEATER+

CN315

5
3
1
7

KR
KG
KB
HEATER+

FV

FC

HV

CN318

V901

PICTURE TUBE

7

10 17 18

11 10

2

C

TO D BOARD

CN604

TO D BOARD

FBT

A1

(VIDEO AMP, RGB OUT)

R_IK

G_IK

B_IK

Vcc

OUT

VADJ

7V

9

10
11

6
7
8
1
4

15
16

2
3

13

DDC GND1
DDC SCL1
DDC SDA1
DDC GND2
DDC SCL2
DDC SDA2
H BLK
INPUT SW
IIC SCL
IIC SDA
HS OUT
VS OUT
ECO SW

CN311

1

2

13

12

IC006

INVERTER

IC007

ROM

3

4

11

10

9

8

5

6

SDA
SCL
VCLK

5

6

7

B

2

4

IC005

INVERTER

CN307

HD15

5

4
3

2

1

10

15

9

14

8

13

7

12

6

11

INPUT1(HD15)

5BNC

INPUT2

(BNC)

8
9
2
4
6

VD2
HD2

BLUE2

GREEN2

RED2

CN313

ı

ˇ

LED DRIVE

Q1400

D1400

A

G

LED DRIVE

Q1401

POWER

S1402

CONTROL /

CONTRAST

H1

(USER CONTROL)

2
3
4
5
8

WAKE UP

KEY SCAN

LED1
LED2

INPUT SW

CN1400

D

TO D BOARD

CN1103

Q1402

S1401

S1403

PICTURE

MODE

S1400
MENU

5V

INPUT1

INPUT2

SW

Q004

SW

Q005

VD

R

G

B

HD